<template>
  <div>
    <a href="https://vitejs.dev" target="_blank">
      <img src="/vite.svg" class="logo" alt="Vite logo" />
    </a>
    <a href="https://vuejs.org/" target="_blank">
      <img src="./assets/vue.svg" class="logo vue" alt="Vue logo" />
    </a>
  </div>
  <HelloWorld :msg="name" />
</template>
<script setup lang="ts">
import { ref, onMounted} from 'vue';
import HelloWorld from './components/HelloWorld.vue';
import { getCurrentInstance } from 'vue';
const instance = getCurrentInstance();
let name  = ref();
onMounted(() =>{
  name.value = instance?.appContext.config.globalProperties.$a;
  console.log(name);
});

// let title = ref<string>();
// title.value = instance.proxy.$a// 访问全局属性
</script>
<style scoped>
.logo {
  height: 6em;
  padding: 1.5em;
  will-change: filter;
  transition: filter 300ms;
}
.logo:hover {
  filter: drop-shadow(0 0 2em #646cffaa);
}
.logo.vue:hover {
  filter: drop-shadow(0 0 2em #42b883aa);
}
</style>
